Mon Oct 13, F. Flechtner
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Nield, Grace A., Whitehouse, Pippa L., van der Wal, Wouter, Blank, Bas, O'Donnell, John Paul, and Stuart, Graham W., 2018. The impact of lateral variations in lithospheric thickness on glacial isostatic adjustment in West Antarctica. Geophysical Journal International, 214(2):811–824, doi:10.1093/gji/ggy158.
• from the NASA Astrophysics Data System • by the DOI System •
@ARTICLE{2018GeoJI.214..811N,
author = {{Nield}, Grace A. and {Whitehouse}, Pippa L. and {van{\^A} der{\^A} Wal}, Wouter and {Blank}, Bas and {O'Donnell}, John Paul and {Stuart}, Graham W.},
title = "{The impact of lateral variations in lithospheric thickness on glacial isostatic adjustment in West Antarctica}",
journal = {Geophysical Journal International},
keywords = {Creep and deformation, Satellite geodesy, Antarctica, Dynamics of lithosphere and mantle, Rheology: crust and lithosphere, Rheology: mantle},
year = 2018,
month = aug,
volume = {214},
number = {2},
pages = {811-824},
abstract = "{Differences in predictions of Glacial Isostatic Adjustment (GIA) for
Antarctica persist due to uncertainties in deglacial history and
Earth rheology. The Earth models adopted in many GIA studies are
defined by parameters that vary in the radial direction only and
represent a global average Earth structure (referred to as 1-D
Earth models). Oversimplifying the actual Earth structure leads
to bias in model predictions in regions where Earth parameters
differ significantly from the global average, such as West
Antarctica. We investigate the impact of lateral variations in
lithospheric thickness on GIA in Antarctica by carrying out two
experiments that use different rheological approaches to define
3-D Earth models that include spatial variations in lithospheric
thickness. The first experiment defines an elastic lithosphere
with spatial variations in thickness inferred from seismic
studies. We compare the results from this 3-D model with results
derived from a 1-D Earth model that has a uniform lithospheric
thickness defined as the average of the 3-D lithospheric
thickness. Irrespective of the deglacial history and
sublithospheric mantle viscosity, we find higher gradients of
present-day uplift rates (i.e. higher amplitude and shorter
wavelength) in West Antarctica when using the 3-D models, due to
the thinner-than-1-D-average lithosphere prevalent in this
region. The second experiment uses seismically inferred
temperature as an input to a power-law rheology, thereby
allowing the lithosphere to have a viscosity structure.
Modelling the lithosphere with a power-law rheology results in a
behaviour that is equivalent to a thinner lithosphere model, and
it leads to higher amplitude and shorter wavelength deformation
compared with the first experiment. We conclude that neglecting
spatial variations in lithospheric thickness in GIA models will
result in predictions of peak uplift and subsidence that are
biased low in West Antarctica. This has important implications
for ice-sheet modelling studies as the steeper gradients of
uplift predicted from the more realistic 3-D model may promote
stability in marine-grounded regions of West Antarctica.
Including lateral variations in lithospheric thickness, at least
to the level of considering West and East Antarctica separately,
is important for capturing short-wavelength deformation and it
has the potential to provide a better fit to Global Positioning
System observations as well as an improved GIA correction for
the Gravity Recovery and Climate Experiment data.}",
doi = {10.1093/gji/ggy158},
adsurl = {https://ui.adsabs.harvard.edu/abs/2018GeoJI.214..811N},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
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